<!DOCTYPE html>
<html lang="en">
  <head>
    <title></title>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
  </head>
  <style>
    .spinner {
      width: 40px;
      height: 40px;
      margin: 100px auto;
      background-color: #333;
      border-radius: 100%;
      -webkit-animation: scaleout 1s infinite ease-in-out;
      animation: scaleout 1s infinite ease-in-out;
    }

    @-webkit-keyframes scaleout {
      0% {
        -webkit-transform: scale(0);
      }
      100% {
        -webkit-transform: scale(1);
        opacity: 0;
      }
    }

    @keyframes scaleout {
      0% {
        transform: scale(0);
        -webkit-transform: scale(0);
      }
      100% {
        transform: scale(1);
        -webkit-transform: scale(1);
        opacity: 0;
      }
    }
  </style>

  <body>
    <div class="spinner"></div>
  </body>
</html>
